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Condition and productivity of marginal oak and beech plantations in the southern part of the Right Bank Forest Steppe of Ukraine

Sergiy Koval (1), Olexandr Ostapchuk (1), Volodymyr Shlapak (1), Olexandr Bayura (1), Olexandr Sovakov (2), Volodymyr Vitenko (3)*, Roman Podzerei (3), and Oleh Lazariev (1)

1. Department of Forestry, Faculty of Forestry and Landscape Gardening, Uman National University of Horticulture, Uman, Ukraine. *E-mail: uman.vitenko@ukr.net
2. National University of Life and Environmental Sciences of Ukraine, Kyiv, Ukraine.
3. Pavlo Tychyna Uman State Pedagogical University, Uman, Ukraine.
Abstract:

The condition and productivity of marginal oak-beech plantations in the conditions of fresh hornbeam grove of the southern part of the Right Bank Forest Steppe of Ukraine, outside the natural habitat of European beech have been studied. It was found that with the observance of agricultural techniques and timely silvicultural care and felling of plantations at the age of 19–20 productive crops are formed with an average height of beech trees 9.2–10.4 m, diameter 11.8–12.7 cm, preservation of 352–386 pieces·ha-1, which grow according to Ib class of quality. In the studied oak-beech crops of European beech trees lag behind in growth from common oak trees, but according to taxonomic indicators, hornbeam, sharp-leaved maple, birch and heart-leaved linden trees predominate. The prospects of growing of beech in non-range conditions have been established, as it can compete with aboriginal forest species.

Received: 19 September 2022 / Accepted: 04 January 2023 / Available online: 18 January 2023

Open Access: This article is licensed under a Creative Commons Attribution 4.0 International License.
(Forestry Ideas, 2023, Vol. 29, No. 1) [Download]
Downloads: 250

Bioinsecticidal activity of essential oil of Mentha arvensis L. grown in forest area on Helicoverpa armigera Hub. in tobacco and Apis mellifera L.

Zheko Radev

Tobacco and tobacco products institute, Agricultural Academy, Bulgaria. E-mail: zhekoradev@abv.bg
Abstract:

In laboratory conditions bioinsecticidal effect of Mentha arvensis L. essential oil (EO) on Helicoverpa armigera Hub. 3rd instar larva on tobacco and Apis mellifera L. was found. There were differences between the efficacy of the divers concentrations. Good bioinsecticidal effect of 48 % was detected at concentration of 1.25 % v/v, high effect of 92 % at concentration of 2.5 % v/v and 100 % efficacy at 5 % v/v. Phytotoxicity on tobacco plants was found only at 5 % v/v EO concentration. The concentrations of 2.5 % v/v and even the less than 1.25 % v/v could be used to control the pest H. armigera. Concentrations of 1.25 % v/v and 2.5 % v/v applied under the same conditions to A. mellifera showed 100 % toxicity to the bees as well.

Received: 25 October 2022 / Accepted: 09 January 2023 / Available online: 18 January 2023
 
Open Access: This article is licensed under a Creative Commons Attribution 4.0 International License. 
 
(Forestry Ideas, 2023, Vol. 29, No. 1) [Download]
Downloads: 254

Test for contact toxicity of Thymus pulegioides L. essential oil on Helicoverpa armigera Hub. in tobacco and Apis mellifera L.

Zheko Radev

Tobacco and tobacco products institute, Agricultural Academy, Bulgaria. E-mail: zhekoradev@abv.bg
Abstract:

Thymus pulegioides L. essential oil (EO) in different concentrations was tested in laboratory conditions on Helicoverpa armigera Hub. 3rd instar larva on tobacco and Apis mellifera L. bees, and the results showed bioinsecticidal activity. Differences were found between the effectiveness of various concentrations as higher concentrations showed higher efficiency. Low toxicity of 36 % was found at concentration of 1.25 % essential oil, concentration of 2.5 % produced high toxicity of 76 % while concentration of 5 % produced 100 % toxicity. All the concentrations of T. pulegioides EO tested in the same conditions on A. mellifera showed 100 % toxicity.

Received: 25 October 2022 / Accepted: 09 January 2023 / Available online: 18 January 2023

Open Access: This article is licensed under a Creative Commons Attribution 4.0 International License.
(Forestry Ideas, 2023, Vol. 29, No. 1) [Download]
Downloads: 280

Medicinal species of conservation importance from the Bulgarian flora

Alexander Tashev and Violeta Dimitrova

University of Forestry, Faculty of Forestry, Department of Dendrology, 10 Kliment Ohridski Blvd., 1797 Sofia, Bulgaria. E-mails: vilydi@abv.bg, altashev@abv.bg
Abstract:

From antiquity to the present day, man has used plants for various purposes, most of them being used for the treatment of various diseases. However, some medicinal plants are of varying degrees of threat. The purpose of this study is to establish and analyse the conservation status of medicinal plants from the flora of Bulgaria. Of total 954 species of medicinal plants in the flora of Bulgaria, 290 are considered to be of conservation importance: Bulgarian and Balkan endemics; species listed in the Red Data Book of Bulgaria and their categories of endangerment; species in the Annexes of the Biodiversity Conservation Act in Bulgaria; species included in the Bern Convention; species in the Annexes to the Habitats Directive; species under the protection of the International Convention on Trade in Wildlife; medicinal plants in Bulgaria listed in the World Red List of Plants; species in the European Red List and European Red List of Medicinal plants of different categories; List of rare and endangered endemic plants in Europe; species, which are tertiary and glacial relicts. The collection of these species must take into account their condition and comply with the regulations governing their use and conservation.

Received: 07 April 2022 / Accepted: 25 January 2023 / Available online: 08 February 2023

Open Access: This article is licensed under a Creative Commons Attribution 4.0 International License.
(Forestry Ideas, 2023, Vol. 29, No. 1) [Download]
Downloads: 244

Rooting of sycamore (Acer pseodoplatanus L.) cuttings by etiolated shoots

Nasko Iliev (1)* and Lyubka Varbeva (2)

 

1. University of Forestry, 10 K. Ohridski Blvd., 1756 Sofia, Bulgaria. *E-mail: ilievnasko@abv.bg
2. Executive Forest Agency, 55 H. Botev Blvd., 1000 Sofia, Bulgaria.
Abstract:

The aim of the study is to investigate the possibility of shoots’ etiolation and long-term auxin effect on rooting of stem cuttings from sycamore. 3-year-old seedlings and 40-year-old mature donor were used, phase-rejuvenated through cutting of the stem at the height of the root collar. Traditional and alternative rooting methods were studied as well. The alternative variant was an attempt for rooting of etiolated and de-etiolated shoots. In the beginning of May, etiolated shoots were obtained. The leaves from the first node were cut to base. The node was subject of auxin treatment with lanoline-based 8000 mg·L-1 IBA (Indole-3-butyric acid) paste. It was used through a single application after cutting up and long-term auxin treatment. The traditional methods for rooting did not give a positive result. Precondition for propagation by cuttings was i) donor plants darkening two months before the beginning of growing period to obtain etiolated shoots with one node; ii) treatment of the basal node in the beginning of May with 8000 mg·L-1 IBA paste and its protection with aluminium foil; iii) parallel uncovering of the donors for de-etiolation 4 weeks before planting. Rooting reached up to 72 %. Successful rooting was not achieved with cuttings from a mature donor. However, in 77.33 % of the etiolated cuttings with long-term treatment before separation from the donor plant callus was formed in the basis. Root caps were developed from the callus, lenticels and the basis of the cuttings. Their average number was 26.05 and reached up to 113. After planting of these cuttings root caps continued to grow and reached length up to 4 mm. Parallelly the above-ground part necrotised.

Received: 20 June 2022 / Accepted: 20 February 2023 / Available online: 27 February 2023


Open Access: This article is licensed under a Creative Commons Attribution 4.0 International License.
(Forestry Ideas, 2023, Vol. 29, No. 1) [Download]
Issues: 1-5 | 6-10 | 11-15 | 16-16